Fujitsu AOUH09LPAS1, Service Manual

Page: 69 / 163

2-21. E: A1. Discharge temperature error (Outdoor unit)
Indicator Indoor unit
Operation indicator 10 time flash
Timer indicator 1 time flash
Economy indicator Continuous flash
Error code E: A1
Detective actuator
Outdoor unit main PCB Protection stop by discharge temperature ≥ 230 °F
(110 °C) during compressor operation generated 2 times
within 24 hours.
Discharge temperature thermistor
Forecast of cause
3-way valve not opened
EEV or capillary tube defective, strainer clogged
Outdoor unit operation failure, foreign matter on heat
exchanger
Discharge temperature thermistor failure
Insufficient refrigerant
Main PCB failure
Check point 1. Check if 3-way valve is open
If the 3-way valve is closed, open the 3-way valve and check operation.
NOTE: For cooling operation, check gas side of the 3-way valve.
For heating operation, check liquid side of the 3-way valve.
↓
Check point 2. Check any of the electronic expansion valve (EEV), capillary tube, or strainer, or all
• Check if EEV open or there is a capillary tube defect.
Refer to outdoor unit Electrronic Expansion Valve (EEV) or Capillary tube in
"Service parts in-
formation" on page 03-36.
• Check the strainer clogging.
↓
Check point 3. Check the outdoor unit fan and heat exchanger
• Check for foreign object at heat exchanger
• Check if fan can be rotated by hand.
• Check the motor. (Refer to outdoor unit fan motor in "Service parts information" on page 03-
36.)
↓
Check point 4. Check the discharge thermistor
The discharge temperature thermistor characteristics check. (Check by disconnecting thermistor
from PCB.)
NOTE: For the characteristics of the thermistor, refer to "Thermistor resistance values" on page
03-42.
↓
2-21. E: A1. Discharge temperature error (Outdoor unit)
- (03-27) -
2. Troubleshooting with error code
TROUBLESHOOTING TROUBLESHOOTING